Sullivan County, Pennsylvania Demographics 2026

Population Overview

Sullivan County is located in Pennsylvania with a total population of 5,888. It is the 66th most populous county out of 67 in Pennsylvania. The county encompasses 4 Census-designated places.

Age Demographics

The median age in Sullivan County is 55.9 years. This is 37% higher than the state median of 40.9 years. Only 10.4% of residents are under 18, indicating fewer families with children. 12.8% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Sullivan County is $69,764. This is 11% lower than the state median of $77,971. It is also 14% lower than the national median of $80,734. The poverty rate stands at 11.6%. This is 1% lower than the state poverty rate of 11.7%. The unemployment rate is 5.8%. This is 11% higher than the state rate of 5.3%. The median home value is $197,100. Housing costs are 23% lower than the state median of $254,500. With a home-value-to-income ratio of just 2.8x, Sullivan County is one of the most affordable housing markets in the area. 85.0% of occupied housing units are owner-occupied. This homeownership rate is 23% higher than the state average of 69.3%.

Race & Ethnicity

Sullivan County has a predominantly White (non-Hispanic) population, comprising 93.2% of all residents. Hispanic or Latino residents account for 2.3%. The Black or African American population (2.3%) is well below the state average of 10.3%. The Hispanic or Latino population (2.3%) is well below the state average of 8.7%. The Asian population (0.1%) is well below the state average of 3.8%.

Education

21.5% of residents aged 25 and older hold a bachelor's degree or higher. This is 39% lower than the state rate of 35.2%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 92.5%.

Data Sources & Methodology

All figures for Sullivan County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against Pennsylvania and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.